/*
 * Copyright 2023 AntGroup CO., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */

package com.antgroup.geaflow.dsl.sqlnode;

import com.google.common.collect.ImmutableList;
import java.util.List;
import org.apache.calcite.sql.SqlDrop;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;

public class SqlDropGraph extends SqlDrop {

    private SqlIdentifier name;

    private static final SqlOperator OPERATOR = new SqlSpecialOperator("SqlDropGraph",
        SqlKind.DROP_GRAPH);

    public SqlDropGraph(SqlParserPos pos, SqlIdentifier name) {
        super(OPERATOR, pos, false);
        this.name = name;
    }

    @Override
    public void setOperand(int i, SqlNode operand) {
        switch (i) {
            case 0:
                this.name = (SqlIdentifier) operand;
                break;
            default:
                throw new IllegalArgumentException("Illegal index: " + i);
        }
    }

    @Override
    public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
        writer.keyword("drop");
        writer.keyword("graph");
        name.unparse(writer, 0, 0);
    }

    @Override
    public List<SqlNode> getOperandList() {
        return ImmutableList.of(name);
    }
}
